IsolatedStorageFilePermissionAttribute クラス
宣言セキュリティを使用して、IsolatedStorageFilePermission のセキュリティ アクションをコードに適用できるようにします。このクラスは継承できません。
名前空間: System.Security.Permissions
アセンブリ: mscorlib (mscorlib.dll 内)
構文
解説
使用例
継承階層
スレッド セーフ
プラットフォーム
バージョン情報
参照
アセンブリ: mscorlib (mscorlib.dll 内)
構文<SerializableAttribute> _ <ComVisibleAttribute(True)> _ <AttributeUsageAttribute(AttributeTargets.Assembly Or AttributeTargets.Class Or AttributeTargets.Struct Or AttributeTargets.Constructor Or AttributeTargets.Method, AllowMultiple:=True, Inherited:=False)> _ Public NotInheritable Class IsolatedStorageFilePermissionAttribute Inherits IsolatedStoragePermissionAttribute
[SerializableAttribute] [ComVisibleAttribute(true)] [AttributeUsageAttribute(AttributeTargets.Assembly|AttributeTargets.Class|AttributeTargets.Struct|AttributeTargets.Constructor|AttributeTargets.Method, AllowMultiple=true, Inherited=false)] public sealed class IsolatedStorageFilePermissionAttribute : IsolatedStoragePermissionAttribute
[SerializableAttribute] [ComVisibleAttribute(true)] [AttributeUsageAttribute(AttributeTargets::Assembly|AttributeTargets::Class|AttributeTargets::Struct|AttributeTargets::Constructor|AttributeTargets::Method, AllowMultiple=true, Inherited=false)] public ref class IsolatedStorageFilePermissionAttribute sealed : public IsolatedStoragePermissionAttribute
/** @attribute SerializableAttribute() */ /** @attribute ComVisibleAttribute(true) */ /** @attribute AttributeUsageAttribute(AttributeTargets.Assembly|AttributeTargets.Class|AttributeTargets.Struct|AttributeTargets.Constructor|AttributeTargets.Method, AllowMultiple=true, Inherited=false) */ public final class IsolatedStorageFilePermissionAttribute extends IsolatedStoragePermissionAttribute
SerializableAttribute ComVisibleAttribute(true) AttributeUsageAttribute(AttributeTargets.Assembly|AttributeTargets.Class|AttributeTargets.Struct|AttributeTargets.Constructor|AttributeTargets.Method, AllowMultiple=true, Inherited=false) public final class IsolatedStorageFilePermissionAttribute extends IsolatedStoragePermissionAttribute
解説宣言の許容スコープは、使用する SecurityAction によって異なります。
セキュリティ属性によって宣言されたセキュリティ情報は、属性ターゲットのメタデータに格納され、実行時にシステムによってアクセスされます。セキュリティ属性は宣言セキュリティにだけ使用されます。強制セキュリティの場合は、対応するアクセス許可クラスを使用します。
使用例IsolatedStorageFilePermission を要求する正しい方法を示し、コードを実行するためには少なくともこのアクセス許可が必要であり、さらに最大ユーザー クォータが 5 MB 必要であることを次の宣言属性の例に示します。
<Assembly: IsolatedStorageFilePermissionAttribute( _ SecurityAction.RequestMinimum, UserQuota := 5242880)> 'In Visual Basic, you must specify that you are using the assembly scope when making a request.
[assembly:IsolatedStorageFilePermissionAttribute( SecurityAction.RequestMinimum, UserQuota=5242880)] //In C#, you must specify that you are using the assembly scope when making a request.
[assembly:IsolatedStorageFilePermissionAttribute( SecurityAction::RequestMinimum,UserQuota=5242880)]; //In C++, you must specify that you are using the assembly scope when making a request.
/** @assembly IsolatedStorageFilePermissionAttribute(SecurityAction. RequestMinimum, UserQuota = 5242880) */ // In VJ#, you must specify that you are using the assembly scope when making // a request.
リンク時に、呼び出し元のコードに無制限の IsolatedStorageFilePermission を含めることを要求する方法を次の例に示します。通常、メソッドやクラスを不正なコードから保護するための要求がマネージ ライブラリ (DLL) で作成されます。
<IsolatedStorageFilePermissionAttribute( _ SecurityAction.Demand, Unrestricted := True)> _ Public Class SampleClass
/** @attribute IsolatedStorageFilePermissionAttribute(SecurityAction.Demand, Unrestricted = true) */
このアセンブリのコードに IsolatedStoragePermission が必要なことを CLR に伝える方法を次のコード例に示します。この例では、分離ストレージの書き込みと読み取りを行う方法も示します。
using System; using System.Security.Permissions; using System.IO.IsolatedStorage; using System.IO; // Notify the CLR to grant this assembly the IsolatedStorageFilePermission. // This allows the assembly to work with storage files that are isolated // by user and assembly. [assembly: IsolatedStorageFilePermission(SecurityAction.RequestMinimum, UsageAllowed = IsolatedStorageContainment.AssemblyIsolationByUser)] public sealed class App { static void Main() { // Attempt to create a storage file that is isolated by user and assembly. // IsolatedStorageFilePermission granted to the attribute at the top of this file // allows CLR to load this assembly and execution of this statement. using (Stream s = new IsolatedStorageFileStream("AssemblyData", FileMode.Create, IsolatedStorageFile.GetUserStoreForAssembly())) { // Write some data out to the isolated file. using (StreamWriter sw = new StreamWriter(s)) { sw.Write("This is some test data."); } } // Attempt to open the file that was previously created. using (Stream s = new IsolatedStorageFileStream("AssemblyData", FileMode.Open, IsolatedStorageFile.GetUserStoreForAssembly())) { // Read the data from the file and display it. using (StreamReader sr = new StreamReader(s)) { Console.WriteLine(sr.ReadLine()); } } } } // This code produces the following output. // // Some test data.
using namespace System; using namespace System::Security; using namespace System::Security::Permissions; using namespace System::IO::IsolatedStorage; using namespace System::IO; // Notify the CLR to grant this assembly the IsolatedStorage- // FilePermission. This allows the assembly to work with storage // files that are isolated by user and assembly. [assembly: IsolatedStorageFilePermission( SecurityAction::RequestMinimum, UsageAllowed = IsolatedStorageContainment::AssemblyIsolationByUser)]; int main() { try { // Attempt to create a storage file that is isolated by // user and assembly. IsolatedStorageFilePermission // granted to the attribute at the top of this file // allows CLR to load this assembly and execution of this // statement. Stream^ fileCreateStream = gcnew IsolatedStorageFileStream( "AssemblyData", FileMode::Create, IsolatedStorageFile::GetUserStoreForAssembly()); StreamWriter^ streamWriter = gcnew StreamWriter( fileCreateStream); try { // Write some data out to the isolated file. streamWriter->Write("This is some test data."); streamWriter->Close(); } finally { delete fileCreateStream; delete streamWriter; } } catch (IOException^ ex) { Console::WriteLine(ex->Message); } try { Stream^ fileOpenStream = gcnew IsolatedStorageFileStream( "AssemblyData", FileMode::Open, IsolatedStorageFile::GetUserStoreForAssembly()); // Attempt to open the file that was previously created. StreamReader^ streamReader = gcnew StreamReader( fileOpenStream); try { // Read the data from the file and display it. Console::WriteLine(streamReader->ReadLine()); streamReader->Close(); } finally { delete fileOpenStream; delete streamReader; } } catch (FileNotFoundException^ ex) { Console::WriteLine(ex->Message); } catch (IOException^ ex) { Console::WriteLine(ex->Message); } } // This code produces the following output. // // This is some test data.
継承階層
System.Object
System.Attribute
System.Security.Permissions.SecurityAttribute
System.Security.Permissions.CodeAccessSecurityAttribute
System.Security.Permissions.IsolatedStoragePermissionAttribute
System.Security.Permissions.IsolatedStorageFilePermissionAttribute
System.Attribute
System.Security.Permissions.SecurityAttribute
System.Security.Permissions.CodeAccessSecurityAttribute
System.Security.Permissions.IsolatedStoragePermissionAttribute
System.Security.Permissions.IsolatedStorageFilePermissionAttribute
スレッド セーフプラットフォームWindows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。
バージョン情報参照- IsolatedStorageFilePermissionAttribute クラスのページへのリンク
